Dumb Question About Cross Cake On Top Of Sheet Cake

I am making a christening cake for the baptism of my nephew's daughter on Sunday. I am planning to use a sheet cake with a cross. Do I put a board under the cross or place it directly atop the sheet ? I haven't done any decorating lately due to surgery and continuing pain so any suggestions for an easy but pretty cake would be appreciated. thanks.

I've made two of these cakes. One for my daughter's christening and one for a friend's son. The first (my daughter) I didn't use a board. I found there was too much give to the cake when I was crumb coating and covering it with fondant. Yes, I stacked then covered, same with the second but I did put a board and thought it came out really well.

not a problem at all, no cardboard needed. after I had assembledmine I was concerned to but it had no problems with sagging at all. I did a 2nd one and put in some dowels under the cross just to make sure since I was thinking maybe I had just got lucky. Thanks Indydebi for confirming it would be ok without them. Best wishes on your cake.

It's going to be a 2 layer sheet and then the cross so it might be better for cutting to have it on its own board. I'm planning on using a wooden board covered with foil for the main base so it won't bend during transport. I appreciate all the hints because I can use all the help I can get. I did a lot of baking for the holidays but avoided anything that required any decorating other than holly leaves. I hope I haven't bitten off more than I can chew with the cake and decorated cross and heart cookies. I'm using NFSC and MMF with royal for accents on the cookies. Thanks again.